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Experiments on high-current arcs carried out in an ultrahigh vacuum chamber are presented in this paper. For contact separation the lower electrode is moved by a mechanical-pneumatic device simulating the conditions of a vacuum circuit breaker. The arc behavior of the Cu–Cr test electrodes after the electrode separation without application of external magnetic field is observed by a high-speed video...
The paper reports on a study of physical processes occurring in a high-current vacuum arc shunted by semiconductor devices. Dynamics of the current redistribution between the arc discharge in a vacuum circuit breaker (VCB) and an assembly of several semiconductor devices connected in parallel to the VCB is demonstrated.
In the present work, influence of the beginning of the contact opening of the vacuum circuit breaker on the main characteristics of the discharge and the breaking capacity of the breaker is studied. In the experiment, Cu-Cr bulk electrodes with a diameter of twenty millimeters were used. Synthetic circuit generated a half-sinusoidal current with duration of 10 ms and amplitude of 10 kA, followed by...
The cathode voltage drop is considered to be a minimum one on a vacuum arc gap. It is not so in the conditions of competition of a high-current vacuum arc gap and a semiconductor switch starting to operate in parallel after a certain time of arc burning. It was found that such conditions forces arc to burn at lower voltages down to ionization potential of atoms of the cathode material.
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